KEY MAPPING (v2.8) ~ Is there any way to remap the Y axis hotkey to `C` for a more practical use?
Ok, it seems I just needed to say it out loud to actually guess the solution.
Here it is:

.- [menu] Edit -> [entry] Preferences...
-. [section] Keymap
.- [search filter] filter by Key-Binding (rather than by Name)
-. [search field] enter: Y
.- look for Y axis and Y plane  

Then just click on the key binding button (first to last in the row) and press the key you need (C and Shift+C in my case).